Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.
If the third member of a homologous series is C3H8, the fifth member will be
AC 5H8
BC5H9
CC5H10
DC5H11
EC5H12
View Explanation & Discuss
Question 1582
waec1996
What does X represent in the following equation? H 2(g) + 1/2O2(g) → H2O (l); ∆H = xKJ.
ABond energy
BActivation energy
CIonization energy
DEnthalpy of neutralization
EEnthalpy of formation
View Explanation & Discuss
Question 1583
waec1996
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
Acooling the reaction mixture
Busing zinc powder instead of zinc granules
Cusing zinc rod instead of zinc granules
Dcarrying out the reaction at a higher pressure
Ecarrying out the reaction in a closed vessel
View Explanation & Discuss
Question 1584
waec1996
Which of the following is not correct about a catalyst? It
Aremains unchanged chemically at the end of a reaction
Bhelps to establish equilibrium faster reversible reaction
Ccan start a chemical rection which will normally not take place
Dis usually specific in its action
Ealters the rate of chemical reaction
View Explanation & Discuss
Question 1585
waec1996
Which of the following statements is not correct about electrolysis?
AReduction occurs at the anode
BAnions migrate to the anode
CPositive ions migrate to the cathode
DConcentration affects the discharge of ions
EElectrolytes conduct electric current
View Explanation & Discuss
Question 1586
waec1996
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
ANO 2
BN 2O
CNO
DHNO2
EHNO3
View Explanation & Discuss
Question 1587
waec1996
An arrangement of two different metals in aqueous solutions of their salts to produce an electronic current is known as
Aelectrochemical cell
Bactivity series
Cthermocouple
Dvoltameter
Egalvanometer
View Explanation & Discuss
Question 1588
waec1996
The following acids are monobasic except
Atrioxonitrate (V) acid
Bhydrochloric
Cethanoic acid
Dtetraoxophosphorus (V) acid
Edioxonitrate (lll) acid
View Explanation & Discuss
Question 1589
waec1996
Amphoteric oxides are oxides which
Areact with water to form acids
Breact with water to form alkali
Cshow neither acid nor basic properties
Dreact with acids alkalis
Econtain high proportion of oxygen
View Explanation & Discuss
Question 1590
waec1996
Which of the following equations represents a neutralization reaction?
ACaCI2 + 2HCI →CI2 +CaCI 2 + H2O
BNa2O2 + H2SO4 → Na2SO4 + H2O2
CH2SO4 + KOH → KHSO4 + H2 O
D2Na + 2H2O → 2NaOH + H2
ECuSO4 + 2NaOH → Cu(OH)2+ Na2SO4
View Explanation & Discuss
Question 1591
waec1996
A solution of pH 7 is
Aacidic
Bneutral
Cconcentrated
Ddilute
Esaturated
View Explanation & Discuss
Question 1592
waec1996
What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]
A11.20dm3
B5.60dm3
C2.24dm3
D0.56dm3
E0.28dm3
View Explanation & Discuss
Question 1593
waec1996
''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of
ACharles Law
BBoyle's Law
CAvogadro's Law
DGraham's Law
EGay Lussac's Law
View Explanation & Discuss
Question 1594
waec1996
What is the likely formula of compound formed between element M in group two and element X in group seven?
AM7X2
BM2X
CM2X7
DMX2
EMX6
View Explanation & Discuss
Question 1595
waec1996
The alkali metals exhibit similar chemical properties because
Athey occur in the combined state
Bthey have the same number of vallence electrons
Cthey form crystalline salts
Dtheir salts are soluble in water
Ethey are highly reactive
View Explanation & Discuss
Question 1596
waec1996
When an atom gains an electron, it becomes
Achemically inactive
Bnegatively charged
Coxidized
Da cation
Ea complex ion
View Explanation & Discuss
Question 1597
waec1996
The existance of two or more forms of the same element in the same physical state is known as
Aallotropy
Bresonance
Chybridization
Disotopy
Eisomerism
View Explanation & Discuss
Question 1598
waec1995
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
A0.1 mole
B0.2mole
C0.3 mole
D1.0 mole
E2.9 moles
View Explanation & Discuss
Question 1599
waec1995
What is the amount (in mole) of hydrogen gas that would be produced if 0.6 mole of hydrochloric acid reacted with excess zinc according to the following equation? Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
A0.1 mole
B0.2mole
C0.3 mole
D1.0 mole
E2.9 moles
View Explanation & Discuss
Question 1600
waec1995
The following salts dissolve readily in cold water except
